Sign language · Hands

Finger-spelling

Target Forearms  ·  Equipment Body weight  ·  Level Beginner  ·  Reps 2

Finger-spelling is a beginner-level sign language movement targeting the forearms, written in Posecode, a small open-source language that LLMs like ChatGPT, Claude, and Gemini can write to describe human movement as text. Every joint angle below is hard-clamped to a safe range of motion.

How to do it

1. Present the hand1s · ease-out Bring the hand up in front of the chest, palm forward
2. Letter A1.5s · ease-in-out A: fingers curled into a fist, thumb resting alongside
3. Letter B1.5s · ease-in-out B: fingers straight and together, thumb across the palm
4. Letter I1.5s · ease-in-out I: only the little finger stands up
5. Relax1.2s · ease-out Open the hand and lower the arm

The .posecode source

This is the exact text an LLM writes to produce the animation above: phases and joint angles, not 3D transforms.

posecode posture "Finger-spelling (approx.)"
  rig humanoid
  pose start = standing

  step "Present the hand" 1s ease-out:
    shoulder_right: flex 15
    elbow_right: flex 140
    cue "Bring the hand up in front of the chest, palm forward"

  step "Letter A" 1.5s ease-in-out:
    index_right: flex 95
    middle_right: flex 95
    ring_right: flex 95
    pinky_right: flex 95
    thumb_right: flex 0
    cue "A: fingers curled into a fist, thumb resting alongside"

  step "Letter B" 1.5s ease-in-out:
    index_right: flex 0
    middle_right: flex 0
    ring_right: flex 0
    pinky_right: flex 0
    thumb_right: flex 60
    cue "B: fingers straight and together, thumb across the palm"

  step "Letter I" 1.5s ease-in-out:
    index_right: flex 95
    middle_right: flex 95
    ring_right: flex 95
    pinky_right: flex 0
    thumb_right: flex 60
    cue "I: only the little finger stands up"

  step "Relax" 1.2s ease-out:
    fingers_right: flex 0
    shoulder_right: flex 0
    elbow_right: flex 0
    cue "Open the hand and lower the arm"

  repeat 2

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