Suppose I arrange the numbers 40, 30, 20, 10 in the corner positions of a 3\*3 array. To be precise, the number 40 (resp. 30, 20, 10) is located at the top-left (resp., bottom-left, top-right, bottom-right) corner. I have 3 questions: 

Q1. How to type a symbol at the left-middle position to indicate that 40 is larger than or equal to 30? I think the symbol looks like of shape "V" together with a vertical bar aside (at the left or right side of the shape "V").

Q2. How to type a symbol in the middle position of the array to mean that 40 is larger than or equal to 10? I imagine that it appears like a skew "V" with it mouth pointing to 40, and with a bar aside again.

Q3. How to type a single symbol at the middle position, meaning that "40 is larger than or equal to 10, and 30 is larger than or equal to 20"? I hope it looks like a brute-force combination of the symbol from Q2 and its analog.

I need these folk math symbols in a beamer presentation. Wish someone kindly give me a collection of feasible TeX codes to do them, so that I can learn how to make such symbols in TeX. Or, are there ready-made codes in any TeX packages? Thanks in advance!

Here is an MWE:

Thanks Henri. Here is an MWE:

```
\documentclass{amsart}
\begin{document}
\[
\begin{array}{ccc}
40 & > & 20\\
Q1 & Q2/Q3 & *\\
30 & > & 10
\end{array}
\]
\end{document}

```