Similarity of the Bench and Other Cypher Symbols with 15th Century Latin

[Dobri]

What the bench symbol could hint at (if it is an abbreviation for a specific sequence of several letters) is that in the unknown language there is a frequent occurrence of specific 3- or 4-letter arrangements. 

The gallows (consonants ?) and several shapes added above the bench (vowels ?) appear nested (benched) in the unknown letter arrangement of the bench.

This observation could be used for comparison with Latin, Greek, German, French, etc. writings of the early 15th century by identifying specific 3- or 4- letter arrangements occurring with high frequencies in said languages.