Symbol not familiar in database

Transact-SQL
1

hi EXPERT team,

i have a received a database file for analysis.

i was worried that the symbol motioned was not familiar .

if any one have any idea please let me know.

in the below diagram.
i was seeing three symbols

  1. primary key (yellow color)
  2. blue color box with green color anti clock wise arrow on top of box.
  3. blue color box with lines inside.
    waiting for your response.

2

is this sql server?