A thought on what this could be, if there is a language behind it. Not a claim, just the picture that fits best, and I'll test it.
The four glyphs split in two groups that behave differently, and each group looks like a process that exists in real languages.
y and o before a gallows look like a prop vowel in front of a heavy consonant. If I am not wrong, old Italian did this: "in Ispagna" but "la Spagna", "per iscritto" but "lo scritto". The i shows up after a consonant, disappears after a vowel, and is also there when the word stands alone. Spanish and Catalan did the same and then kept the vowel for good: Latin schola became escuela / escola. That's what y and o do: they appear after n, r, d, s, m, not after o, y, l, and they are almost always there at the start of a label or after a drawing.
q between a y and an o looks like a bridge consonant between two vowels, like the Italian "ad un, ed ecco" or the English "the idea-r-of it". Spanish does something similar with its little words, it changes them so that two vowels don't meet: "padres e hijos", "siete u ocho". Catalan does it all the time with its pronouns: "em dic" but "m'agrada", "el pare" but "l'avi". Those sounds and changes only happen when speech runs on, never before a pause. Same for q: it almost never starts a label, it drops after a drawing, and when it's missing after a y the space is wider.
The line break sits in the middle for both (around 55-60%), which makes sense if a line end is sometimes a pause and sometimes not. And two thirds instead of always is what I'd expect from someone writing as he hears, with no fixed spelling.
What doesn't fit is d. If it were a bridge like q it should vanish at pauses, and it's the opposite: it is there at almost every line start and after most drawings. Maybe daiin is just the full form and aiin a reduced one, or d is a small word stuck to the next one. I don't know yet.
If this is right then gallows are heavy consonants, o and y are vowels, and n, r, s, d, m are consonants. Which is what several people here already think.
Some things I want to check: whether the choice between y and o depends on the vowels of the previous word, whether the q at line start behaves like the one inside the line, and whether the rate of these glyphs changes by section (sounds shouldn't care about the topic, words would). I'll come back with that.
And of course the same four things can be done by a hand that just looks one glyph back, with no sound behind it. I can't rule that out. But if there is sound, this is the shape it has.
The four glyphs split in two groups that behave differently, and each group looks like a process that exists in real languages.
y and o before a gallows look like a prop vowel in front of a heavy consonant. If I am not wrong, old Italian did this: "in Ispagna" but "la Spagna", "per iscritto" but "lo scritto". The i shows up after a consonant, disappears after a vowel, and is also there when the word stands alone. Spanish and Catalan did the same and then kept the vowel for good: Latin schola became escuela / escola. That's what y and o do: they appear after n, r, d, s, m, not after o, y, l, and they are almost always there at the start of a label or after a drawing.
q between a y and an o looks like a bridge consonant between two vowels, like the Italian "ad un, ed ecco" or the English "the idea-r-of it". Spanish does something similar with its little words, it changes them so that two vowels don't meet: "padres e hijos", "siete u ocho". Catalan does it all the time with its pronouns: "em dic" but "m'agrada", "el pare" but "l'avi". Those sounds and changes only happen when speech runs on, never before a pause. Same for q: it almost never starts a label, it drops after a drawing, and when it's missing after a y the space is wider.
The line break sits in the middle for both (around 55-60%), which makes sense if a line end is sometimes a pause and sometimes not. And two thirds instead of always is what I'd expect from someone writing as he hears, with no fixed spelling.
What doesn't fit is d. If it were a bridge like q it should vanish at pauses, and it's the opposite: it is there at almost every line start and after most drawings. Maybe daiin is just the full form and aiin a reduced one, or d is a small word stuck to the next one. I don't know yet.
If this is right then gallows are heavy consonants, o and y are vowels, and n, r, s, d, m are consonants. Which is what several people here already think.
Some things I want to check: whether the choice between y and o depends on the vowels of the previous word, whether the q at line start behaves like the one inside the line, and whether the rate of these glyphs changes by section (sounds shouldn't care about the topic, words would). I'll come back with that.
And of course the same four things can be done by a hand that just looks one glyph back, with no sound behind it. I can't rule that out. But if there is sound, this is the shape it has.