Can someone tell me what car part is this? I lost it while parking today without noticing

I parked my car today and it was only when my dad noticed while going into the garage. He told me that I lost this part that he noticed it was missing, if anyone can help me by letting me know what this part is called so I can replace it, it would help immensely. Image Here!

I didn’t feel the hit at all when I was parking, which is why I am confused.

submitted by /u/throwmetrash1214
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