The study of the fundamental nature of knowledge, reality, and existence, especially when considered as an academic discipline.
The movement forward from head is also acceptable.
The earlier ASL sign (late 20th century) is used with the handshape "P" moving down and couple of times in front of the forehead.
Related signs: WISE/WISDOM, THEORY.
ASL signs for the category of countries, including continents.
ASL signs for the category of cities around the world plus states and provinces in North America. Note that many loanwords/signs are borrowed from other countries if not available in ASL.
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