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That particular node is actually pretty well documented. From wiki/depthimage_to_laserscan - Node - depthimage_to_laserscan - Published topics:

2.1.2 Published Topics

scan (sensor_msgs/LaserScan)

The output laser scan. Follows REP 117, and will output range arrays that contain NaNs and +-Infs.

If you follow the link to the sensor_msgs/LaserScan documentation, it should be pretty clear.

That particular node is actually pretty well documented. From wiki/depthimage_to_laserscan - Node - depthimage_to_laserscan - Published topics:

2.1.2 Published Topics

scan (sensor_msgs/LaserScan)

            The output laser scan. Follows REP 117, and will output range arrays that contain NaNs and +-Infs.

If you follow the link to the sensor_msgs/LaserScan documentation, it should be pretty clear.

That particular node is actually pretty well documented. From wiki/depthimage_to_laserscan - Node - depthimage_to_laserscan - Published topics:

2.1.2 Published Topics

scan (sensor_msgs/LaserScan)

                    The output laser scan. Follows REP 117, and will output range arrays that contain NaNs and +-Infs.

If you follow the link to the sensor_msgs/LaserScan documentation, it should be pretty clear.