Duployan letter S J

It’s one compound consonant letter, named for S and J.

Duployan shorthand uses simple lines and curves for consonants and vowels. Here, S J names one letter, not two separate marks.

Adaptations assign some letters different values: this same glyph is used for J in Chinook writing and Perrault’s English shorthand. Read it within that system; the S J label does not set a universal pronunciation.

Why can the letter look different in a word?

Its stroke usually continues into the next letter.

Duployan consonants keep a fixed orientation, but their strokes usually connect to adjacent letters. The form shown alone in a character chart is its isolated shape; the joining stroke can look different within a written word.