If you want to invent your own number plate, there are a few things you need to know. In the United States, number plates are issued by state governments and the District of Columbia. Each state has its own rules about what numbers and letters can be used on a plate. In general, however, you cannot use profanity or obscenities, nor can you use words that could be considered offensive. Additionally, the characters on your plate must be readable from a distance of at least 50 feet.
There are also some restrictions on the design of your plate. For example, most states require that the letters and numbers be in contrasting colors so that they can be easily read. Additionally, many states have requirements for the spacing between characters and for the overall size of the plate.
If you're looking to create a truly unique plate, you may want to consider working with a professional designer. They can help ensure that your design meets all of the necessary requirements while also creating something that is visually appealing and easy to read.