1) Pincer 
[electronics] A clamper is an electronic circuit that fixes either the positive or the negative peak excursions of a signal to a defined value by shifting its DC value. The clamper does not restrict the peak-to-peak excursion of the signal, it moves the whole signal up or down so as to place the peaks at the reference level. A diode clamp (...
• (n.) An instrument of iron, with sharp prongs, attached to a boot or shoe to enable the wearer to walk securely upon ice; a creeper.
Clamp'er noun An instrument of iron, with sharp prongs, attached to a boot or shoe to enable the wearer to walk securely upon ice; a creeper. Kane. 
a clamp; pincer. · a spiked metal plate worn on the sole of a shoe to prevent slipping on ice.