Well, lets see...
Lambda...╗ - certainly does ... not work...
But MS-Character Map does show them as
Λ λ
Ok, lets try the Alt + 955 function ... gives you the ╗
Might have to copy and paste the Lambda symbols below to insert into any document using Forum stripped fonts - I say "stripped" for a reason, they don't have specific characters in which to launch scripts that can become malware - which is more plausible than many realize.
Lambda seems harmless but the Hex code in Python (Linux) can be a disaster example
Code:
Λ or Capital/Uppercase Λ
and
are harmless in ASCII but in machine language - not so much.
Λ λ
Windows can also have corrupted fonts - you have several options...
You can review this link
Several Windows 10 users are reporting that they are suddenly unable to use ALT codes. While some users have an issue with several different Alt Codes,
appuals.com
When they mention Mouse Keys - doesn't not always fix the problem due to the nature of USB keyboards, or in cases of the Laptops and Tablets that requires the use of an external keyboard - all the available ALT key functions may not work.
If you use 5-pin interrupt keyboard, the one with a dedicated port on the back of the Desktop machine - the interrupt it uses - should allow the ALT function and even the 5-digit ALT keys to input special character sets - to work.