safety pin

a pin bent back on itself so as to form a spring, and having the point covered and held with a guard

See safety pin in American Heritage Dictionary 4

noun
  1. A pin in the form of a clasp, having a sheath to cover and hold the point.
  2. A pin that prevents the premature or accidental detonation of an explosive device, such as a bomb or grenade.

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safety pin

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