envelope; CL:個|个[ge4]
信 (xìn) · 9 strokes
Conveys trusting (信) what a person (人) says (言). 人 is also a sound component.
封 (Fēng) · 9 strokes
Depicts using hands (寸) to cultivate plants (丰). Based on the original meaning "create a boundary with plants". The meaning later shifted to "divide off", "seal", and "letter".