策 is a bound form (不成词语素) that rarely stands alone. It appears in common compounds with three main senses: (1) 'strategy, plan, policy' in words like 政策 zhèngcè, 策略 cèlüè, 决策 juécè; (2) 'to urge, to spur on' in 鞭策 biāncè; (3) ancient bamboo or wooden slips used for writing, seen in historical texts. The meaning depends entirely on which compound it forms.