What does ATX stand for when talking about motherboards?

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ATX motherboards and slot single-board computers with backplanes offer longevity support, PCIePCI expansion, and high computing performance

ATX with 12th13th Generation Intel® Core™ LGA1700 Socket Processors, TDP Max 125W, DDR5 DRAM, Multiple Display Ports  Oyster But does it have a PCI slot? I don't think any X370 ever released with a PCI slot Biostar had one but it never released in India

dewa slot 888 ASRock B560M Pro4ac Socket LGA 1200 Micro ATX Motherboard Overview : Supports 10th Gen Intel® Core™ Processors and 11th Gen Intel® Core™ Processors Oyster But does it have a PCI slot? I don't think any X370 ever released with a PCI slot Biostar had one but it never released in India