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What does this F (similar to mathematical function symbol) means in blueprints?

Year of blueprint 40s.

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  • $\begingroup$ Please edit your question and add some context: country, industry, what the drawing is of, year, etc. $\endgroup$
    – Transistor
    Oct 14, 2023 at 22:22

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I think it means finishing the surface. The finish symbol indicates the surface must be machined and finished. source Wiki

The tick line in the middle indicates the direction of the machining!

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