Aperture Science logo with robot

1680 × 1050

Portal turret scene

1920 × 1080

Female Mouse Character — Orange

1000 × 1400

Yellow Warning Sign — Dramatic, Digital Art

1627 × 1050

Warning Sign with People — Yellow, Cautionary, Vector Art

2560 × 1440

Warning Sign Logo — Black

1920 × 1080

Space Battleship Firing Laser

4096 × 2304

Yellow Warning Sign — Black, Serious

1920 × 1080

Yellow Warning Sign — Dramatic

1920 × 1080

Dubstep Zone Warning Sign

1920 × 1080

Radioactive Warning Symbol — Yellow, Dramatic, Digital Art, Metal Surface, Gray

1440 × 1280

Yellow and Black Stripes — Warning, Digital Art, Grunge Texture

1920 × 1080