The Japanese noun '可 (か)' means 'possible' or 'approval'. It is often used in formal or technical contexts to indicate that something is permissible, acceptable, or feasible. For example: This plan is possible「このプランは可です」(このプランはかです). The use of '可' is common in academic or bureaucratic settings, such as grading systems (e.g., '可' as a passing grade). It can also appear in compound words like '可能 (かのう)' (possible) or '許可 (きょか)' (permission). Note that '可' is less commonly used in casual conversation and is more formal in tone.