Which symbol was historically avoided in Christian bookstore logos until the late 20th century due to concerns about commercializing faith?

Religious bookstores, gift shops, and spiritual resource centers represent a significant niche in retail. These businesses face unique challenges in marketing, customer loyalty, and brand development while serving faith communities. This poll explores an interesting aspect of religious retail branding that demonstrates how these specialized businesses communicate their identity and values through visual design.

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The cross
The fish (ichthys)
The dove
The open book