What is a SIGCSE symposium paper?

Sarah Heckman, Jian Zhang, Manuel A. Pérez-Quiñones, Elizabeth K. Hawthorne. What is a SIGCSE symposium paper?. ACM SIGCSE Bulletin, 50(3):3, 2018. [doi]

@article{HeckmanZPH18a,
  title = {What is a SIGCSE symposium paper?},
  author = {Sarah Heckman and Jian Zhang and Manuel A. Pérez-Quiñones and Elizabeth K. Hawthorne},
  year = {2018},
  doi = {10.1145/3243071.3243073},
  url = {https://doi.org/10.1145/3243071.3243073},
  researchr = {https://researchr.org/publication/HeckmanZPH18a},
  cites = {0},
  citedby = {0},
  journal = {ACM SIGCSE Bulletin},
  volume = {50},
  number = {3},
  pages = {3},
}