永 is mainly seen in 永远 (yǒngyuǎn, forever/always). Also: 永久 (yǒngjiǔ, permanent), 永恒 (yǒnghéng, eternal).
history
永 is a famous character in Chinese calligraphy — the '永字八法' (yǒngzì bāfǎ) teaches that this single character contains all eight basic brush strokes needed for writing.
