Lingo Cards (Some rights reserved)
Placeholder = Something used temporarily as a substitute for something that is not known or for something to come later
Recommended Listening
The role of the placeholder – Many of the great scientific discoveries have relied on the use of placeholders to help make accurate predictions. So what is the role of the placeholder in science? And are they always correct?
Elsewhere on the Web
The role of placeholders in science – Arstechnica
Canadian Amateurs Discovered a New Type of Aurora
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Wikipedia
Placeholder
Planeta.com