Čísla a symboly is a free Android app developed by Jan Tursky, categorized under Utilities & Tools. This app is designed to help users navigate through an increasing number of different numbers used in many industries. It includes a wide range of categories such as Greek numbers, important phone numbers, constant symbols, constants of mathematics and physics, numerological numbers, postal codes (ZIP), country codes, prime numbers, area codes, shoe sizes, and basic math sets.

In addition, the app provides a variety of symbol categories such as chemical nomenclature, chemical hazard symbols, HTML codes & tags, Morse code, Roman numerals, colors, flowers and plants, currency symbols, symbols of planets, SR symbols, symbols for maintenance and treatment of textiles, and district markings. The app also features filtering options and the ability to copy and paste numbers. Detailed descriptions of certain categories of items are also available.

Overall, Čísla a symboly is a comprehensive and useful reference app for anyone who works with numbers and symbols in their profession or daily life.