2 layers290.8 × 482.6 mm

The 1N756A is a zener Diode made by Microchip Technology in a DO-7 package with 2 pins. DO-7 Zener Diodes.
PCBKit's library has its KiCad symbol (Device:D_Zener, from KiCad's library), ready for a KiCad board. 8 are in stock at JLCPCB (part C22421924). 1 open-source board in 1 repository on GitHub use it.
The library has no footprint for this part yet.
| Pin | Name | Type |
|---|---|---|
| 1 | K | Passive |
| 2 | A | Passive |

Yes. The symbol is Device:D_Zener, both drawn on this page. PCBKit places them on a board for you when you design with it.
DO-7, with 2 pins.
JLCPCB lists it as part C22421924, with 8 in stock; the sellers' links on this page open their listings.
1 board in 1 repository on GitHub; the most starred are listed on this page, with their KiCad files.