Half-Life 2

Layer 1: Two, white
Layer 2: Triangle, white (trims the left leg of the lamba symbol)
Layer 3: Thin rectangle, orange (makes the left leg of the lamba symbol - it will be too long and be trimmed by layer 2)
Layer 4: Thin rectangle, orange (makes the right leg of the lamba symbol - it will be too short and be extended by layer 5)
Layer 5: Rectangle, orange (small; makes the right "foot" of the lambda symbol)
Layer 6: Rectangle, orange (small; makes the top of the lambda symbol)
Layer 7: Circle, white (mid-sized; makes the white circle in the middle)
Layer 8: Circle, orangle (small; extends the emblem to the upper right)
Layer 9: Circle, orange (large; creates a border around the white circle)
Layer 10/11: Rectangle, orange (fills the border between the two orange circles)