Here's why:
* Sign languages are visual, not written: Sign languages rely on hand shapes, movements, and facial expressions, rather than written symbols.
* "And" is a grammatical concept: The concept of "and" is expressed through the way signs are combined, not through a single sign. For example, in American Sign Language (ASL), you might sign "cat" then "dog" to indicate "cat and dog."
However, there are some ways to express "and" in ASL:
* Using the sign "plus" This is a common way to indicate that two things are being combined or added together.
* Signing "both" This can be used to indicate that both of two things are included.
* Simply placing two signs next to each other This can sometimes be enough to imply that the signs are being connected by "and."
It's important to note that these are just examples, and the specific way to sign "and" may vary depending on the sign language and the specific context.