"feeler" in the noun sense

1. antenna, feeler

one of a pair of mobile appendages on the head of e.g. insects and crustaceans typically sensitive to touch and taste

2. overture, advance, approach, feeler

a tentative suggestion designed to elicit the reactions of others

"she rejected his advances"

3. antenna, feeler

sensitivity similar to that of a receptor organ

"he had a special antenna for public relations"

4. barbel, feeler

slender tactile process on the jaws of a fish

Source: WordNet® (An amazing lexical database of English)

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