Digital electronic technology, what does this connection in the picture mean? Is it a shaping circuit? My input is 1, but the output is still 1. What does it mean?

This is a picture of two NAND gates. The input is 0 and 1 is produced, and all 1 is produced as zero.

When the inputs of pins 1 and 2 of your U40A are both 1, then the three pins are 0; it also means that the pins 1 and 2 of U41A are 0; then the output of U41A is 1. Attached is a symbol table of logic gates for your reference.

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