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A barber's pole is a type of sign used by barbers to signify the place or shop where they perform their craft. The trade sign is, by a tradition dating back to the Middle Ages, a staff or pole with a helix of colored stripes (often red and white in many countries, but usually red, white, and blue in the United States).
A. The fetal pole is the first visible sign of a developing embryo, with the embryoâs head at one end and what looks like a tail at the other end. If you read or hear the term âcrown rump length, or CRL, that describes the measurement from head to âtailâ, which helps to date a pregnancy.