From LSWiki

Class: Language Skills
Attribute: Intelligence
Pedagogy: Procedural
Hidden Skill
Gestural Language
Hands Required: One
Optimal Number of Hands: Two
Language Difficulty: Slightly Easy
Language Speed: Very Slow

The ability to use the Lingua Manu language.  This is a form of sign language, gestural
speech, originally developed by scholars at the University of Altri for the benefit
of the deaf.  It was designed to be easy to master, but this keeps its speed of expression
rather slow, and it is particularly unwieldy to use one-handed.

Notes

Trainers

Wanders: Pierce
Losthaven: Miss Amelia
Association:
Crafty Linguists: Janid Suzak Wanders
Guild:
Ordo Ignis Aeternis: Flizera
Quest: