The character 信[ㄒㄧㄣˋ] means honest or trust. It can also mean a letter or message. Here is the stroke order animation and pronunciation. Here are the individual strokes for writing the character. Here is the definition in Taiwanese Mandarin. Here is the evolution of 信.
信[ㄒㄧㄣˋ]任[ㄖㄣˋ] – to trust in, to believe in
信[ㄒㄧㄣˋ]件[ㄐㄧㄢˋ] – mail, letter