大头钉 Traditional form: 大頭釘 Pinyin (reading): dàtóudīng Definitions: tack thumbtack push pin Characters: 大 - big, great, vast, high, deep 头 - head; chief, boss; first, top 钉 - nail, spike Traditional characters: 大 - big, great, vast, high, deep 頭 - head; chief, boss; first, top 釘 - nail, spike