Duployan Letter K M

It combines K and M; Sloan-Duployan reads it as G G.

K and M are consonant labels here, not a chat abbreviation. Émile Duployé’s French shorthand was first published in 1860 for taking speech down quickly. In 1890, Catholic missionary Jean-Marie Le Jeune adapted it as Chinuk Pipa (Chinook writing) in colonial British Columbia for Chinook Jargon (a Pacific Northwest trade language) and Salish languages. His classes used prayers and catechism, while Indigenous learners also read and wrote local languages. The Kamloops Wawa newsletter carried the script from 1891–1923.

Why does the glyph look different alone?

Neighboring letters determine how its stroke joins.

In handwriting, a Duployan sign flows into the next stroke, so the isolated chart form can differ from its connected outline. That is writing flow, not a new character.