This is the 228th most frequent German word.
zahl
"Zahl" means "number" in English.
Here, 'Zahl' is used as a noun meaning 'number', referring to the count of guests.
Die Zahl der Gäste ist gestiegen.
The number of guests has increased.
In this context, 'zahl' is used as a verb form and means 'pay', addressing someone informally in the imperative mood.
Bitte zahl den Betrag an der Kasse.
Please pay the amount at the checkout.
Here, 'Zahl' again functions as a noun meaning 'number', specifically referring to a numerical value in a table.