Base 12 system
Count:
• 0 both hands together in fists
• 1 one closed fist held forward
• 2 one fist held 1 finger out
• 3
• 4
• 5
• 6 one hand, all fingers splayed
• 7 one hand one fist
• 8 one hadn one fist one finger
• 9
• 10
• 11
• 12 two hands

was how I thought counting might work with 10 digits.