If you need a quick and easy to use resource for coordinate systems search try: EPSG.io. This is an open source web-service providing a database based on the official EPSG database that is maintained by OGP Geomatics Committee.
You can quickly search for an area, name and type like any other web-search engines.
For Example searching "United Kingdom" and click on the British National Grid result produces the following page:
See below for a British National Grid example:
OSGB 1936 / British National Grid - United Kingdom Ordnance Survey - EPSG:27700
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