On Snapchat, the pulsing effect you may see can refer to a few different things, depending on the context in which it appears:
Snapchat Notifications: When you receive a new message or snap, the app icon can pulse or show a notification badge. This usually indicates that there are unread messages or snaps waiting for you to view.
Streaks: If you have a Snapstreak with a friend, you may see a flame emoji next to their name in your friends list. If your streak is about to expire (meaning you haven’t sent a snap within 24 hours), the flame can pulse or change colors to alert you to maintain the streak.
Snap Map: When using the Snap Map feature, the location of friends who have shared their location with you can appear with a pulsing dot. This indicates their current status and location.
Story Notifications: If a friend has posted a new story, the story icon may pulse to draw your attention to it.
Camera Interface: When you’re taking a snap, the shutter button may pulse as a visual cue that you can take a photo or start recording a video.
If you’re referring to a specific feature or visual element that appears in a different context on Snapchat, please provide more details so I can assist you better!