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Double-ended nail – a rare type of nail with points on both ends and the "head" in the middle for joining boards together. See this patent. Similar to a dowel nail but with a head on the shank. Double-headed (duplex, formwork, shutter, scaffold) nail – used for temporary nailing; nails can easily pulled for later disassembly
The recess in the mating part must be designed to accept the particular plow bolt. ASME B18.9 standard recommends a No. 3 head (round countersunk head square neck) plow bolts and No. 7 head (round countersunk reverse key head) plow bolts for new designs. The necessary dimensions for the head styles can be found in the standard. [13] [14] [15]
Double-headed may refer to: Double-headed eagle, common symbol in heraldry and vexillology; Double-heading, the use of two independently operated locomotives at the front of a train; Dual-head, the use of two display devices with a computer; Polycephaly, the state of having two heads; Double-headed playing card
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Typically, it is depicted as a double-headed sea serpent. Sometimes, the symbol features an additional central face of a supernatural being. The sisiutl features prominently in Pacific Northwest art, dances and songs. The sisiutl is closely associated with shamans because both are seen as mediators between the natural and supernatural worlds. [2]
[1] [2] The design consists of a labrys, a type of double-headed axe, superimposed on the inverted black triangle, set against a violet background. The labrys is associated as a weapon used by the Amazons of greek mythology. [3] [4] In the 1970s it was adopted as a symbol of empowerment by the lesbian feminist community. [5]
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