Refers to cleverness in planning or devising strategies, often in a tactical or problem-solving context. Slightly formal/literary tone.
Thanks to his resourcefulness, the company overcame the crisis.
Many Sengoku warlords excelled in ingenuity.
策略 is a scheme or stratagem, often with a nuance of cunning or trickery, whereas 知謀 is a broader, more positive term for clever planning.
Standard kanji form; 知 is the common character for wisdom/knowledge.
Alternate kanji form using 智 (wisdom/intellect); less common but still encountered.
Compound of 知 (wisdom, knowledge) and 謀 (plan, scheme). The exact historical derivation is uncertain, but the combination naturally yields the meaning of clever planning or resourcefulness.