custom metal signs: 11 Thing You're Forgetting to Do
https://v1qqdpy866.doodlekit.com/blog/entry/6547386/15-best-pinterest-boards-of-all-time-about-custom-metal-signs
Perspex is one of these. Its lightweight and transparent sort of thermoplastic can resist breaking unlike glass. So, it truly is an alternative choice to heavier, shatter-vulnerable glass.