Why is there a "0" in the house number?

The "0" in the house number has the following reasons:

1. It is easy to distinguish similar house numbers. In some large buildings, there may be 10 room, 1 1 room, 2 1 room, etc. At this time, it is necessary to use "0" to distinguish, such as "0 1 room" and "1/room".

2. "0" acts as a placeholder in the number sequence. For example, if there are many streets in a certain area of a city, you may need to use "0" to fill in the spaces in the sequence when arranging the house numbers of these streets to ensure that the house numbers of each street are continuous.

3. In some special house numbers, such as 70 1, the "0" indicates that the house is located on the 7th floor. This usage is common in the room numbers of some hotels and apartments.

In addition, different cultures and beliefs may have different interpretations of the auspiciousness of "0" in house numbers. In some cultures, "0" is regarded as an unlucky number because it is associated with the concept of "nothing". However, this is only a question of culture and personal beliefs, and it is not universal.