Big Signs is a new mod which adds Signs with Bigger Text to Minecraft. At the moment, there are two new varieties of sign:
These new signs come in every vanilla wood type, as well as 20 colours of metal. They display much larger text than vanilla signs. The sign's model stays the same, so there is only One Line of text, with room for only a few characters.
The 20 available colours are inspired by the Metal Blocks in my main mod Better Tools and Armor
Resource Pack in Images: Vanilla Tweaks - Smoother Font

One-Line Signs are perfect for displaying large numbers in your world. Say goodbye to typing out large Block characters on each line of a vanilla sign - now you can simply type the number into a One-Line Sign, which will display it much more clearly! This is great for train-related builds in the Create mod (as shown below)

One-Line Signs are also a much more elegant solution than Letter tile blocks, found in some mods. Now, you can fit more than one large letter in the space of one block!

Wooden One-Line Signs are crafted using 1-to-1 recipes with the vanilla signs. 
Metal One-Line Signs can be dyed into any colour variant, from any other colour. The white variants can be crafted in a 3x3 crafting grid using Iron. 
Big Signs is available for Minecraft 1.20.1 on Forge or NeoForge. There are no required dependencies - No other mods are needed to use this mod! Simply place it in your .minecraft/mods folder, and you're good to go.
The mod has been remade from the ground up for 1.12.2, with a limited set of features.
1.12 Features:
I have many more features planned for the Big Signs mod, including physically bigger signs of course!
Thin Signs
Directional Signs
Billboard Blocks
Improved Text GUI