An upside down capital T - as shown below:
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It is Fr
The chemical symbol of francium is Fr.
ABâ”´CDThe symbol for perpendicular in mathematics is an inverse T
Fr
francium
Francium.
The element symbol of francium is Fr. It is a highly radioactive element with atomic number 87, making it one of the rarest naturally occurring elements on Earth.
Francium is a highly radioactive alkali metal element with the atomic number 87 and symbol Fr. It is the second rarest naturally occurring element in the Earth's crust and is extremely unstable, making it difficult to study. Francium was discovered in 1939 by Marguerite Perey.
Pierre
The chemial symbol Fr is derived from the first two letters of the name Francium.
ML-FR
Two lines that are not parallel are perpendicular. The symbol is +.