interpretation of the results of glm analysis

i everyone,
First of all, I express my deep gratitude for the developed product.
I implemented GLM first level analysis on fnirs data.
Implemented using the manual (GLM Analysis (Measured) — MNE-NIRS 0.5.0 documentation)
I translate the results of the analysis into a dataframe table, which displays the results of the analysis ( [glm_est.to_dataframe().head(9)).

What statistical indicator means the value in the column of the table ‘se’?

Thanks in advance for your reply