There are no weird letters in maths. Greek mathematicians were responsible for a significant amount of the early mathematical work and they, naturally used Greek letters. Many of these letters are still used today. Just because you are not familiar with characters in the Greek alphabet does not make them "weird letters".
Those letters can be used to spell "wreath".
There is no English word that uses all nine of those letters. Here's the largest English word you can make with those letters (7 letters): plastic
Those letters will spell arrive.Other words that can be made from those letters are:aairareavereareraerrirerareraverearriverviavie
to make people laugh.
You can make the word SUNFLOWER with those letters.
The letters can be used to spell the 5 letter word weird. They also spell wider and wired.
Those letters spell swivel.
Those letters spell permit.
Those letters spell ledge.
Those letters spell pharaoh.
Those letters will spell impatient.